With subtlety & skill, Sean Bean stars in 'Legends'

TONIGHT'S MUST-SEE: "Legends," 9 p.m., TNT. Big and booming, Sean Bean often plays epic figures. He's been Zeus and Odysseus; he's been killed in "Game of Thrones," "Lord of the Rings," "Henry VIII" and more. So viewers might be surprised tonight to see him playing a shy and stuttering killer. Stick around; this series about FBI undercover work provides real range. Steve Harris leads a team that includes Ali Larter, Tina Majorino and Bean … who shows us (as PBS viewers already knew) he has subtlety and skill.

TONIGHT'S MUST-SEE II: "So You Think You Can Dance," 8-10 p.m., Fox. After Michael Jackson's death five years ago, producer/judge Nigel Lythgoe planned a tribute – then had to dump it when the estate wouldn't allow the music. Now, with a new album coming, there's no problem: First, a group number has the eight finalists dance to the new Jackson single, "A Place With No Name." Then each one (with an "all-star" partner) will dance to a Jackson song, classic or new. Half of the eight specialize in contemporary or jazz; the others are a ballerina, a ballroom dancer and two tap-dancers. Last week, the show ousted its "popper," plus contemporary dancer Bridget Whitman.

TONIGHT'S ALTERNATIVE: "Heartbreakers" debut, 10 p.m., Investigation Discovery. "You've seen too many soap operas," a villain says tonight. Maybe we all have, which makes this idea work. "Heartbreakers" often uses actors from soaps (primetime or daytime) and has a heightened style. That makes sense, because these true stories are filled with human absurdity. Tonight, a pastor in Independence, Mo., (Harry Truman's old town) has a decade-plus affair with the wife of his finance chairman. He gets careless, then lethal. Jack Wagner gives him a bigger-than-life feel; Rob Estes and Jamie Luner (who is particularly good) play it straight, in an oddly entertaining hour

"Mystery Girls," 8:30 p.m., ABC Family. Already wildly over-acted, this show brings in RuPaul as a self-obsessed designer. An ostrich-feather bag has disappeared on the day of his fashion show.

"Modern Family," 9 and 9:30 p.m., ABC. The first rerun finds generations linking – Jay teaching manly ways, Cam and Mitchell leading a culture tour. The second is a funny Las Vegas visit by grown-ups.

"Extant," 10 p.m., CBS. Molly (Halle Berry) comes across footage that may show the real reason she was chosen for the solo space mission. Meanwhile, her android son has his first dream.

"The Bridge," 10 p.m., FX. Most of this hour continues the "Bridge" strengths – richly drawn characters in life-and-death situations, with a powerhouse ending. Still, that's harmed by two flaws – the continued obsession with torture, plus a sudden loss of logic: Knowing powerful people want to kill him, why would a man stroll through town alone, carrying the evidence? We'll forgive it, for now.

"Jennifer Falls" season-finale, 10:30 p.m., TV Land. Jennifer (Jaime Pressly) is suspicious when Adam says she and her daughter can move in with him.